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    Wyświetlanie 1-7 z 7
    Tytuł:
    Numerical modelling and design of ALFC shield loaded by 20 MM FSP fragment
    Autorzy:
    Klasztorny, M.
    Świerczewski, M.
    Dziewulski, P.
    Morka, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/241865.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    light armoured vehicles
    passive protection
    IED
    FSP
    modelling
    simulation
    design
    Opis:
    The study develops numerical modelling and design of the ALFC shield loaded by the 20 mm 54 g FSP fragment moving at impact velocity of 1800 m/s (fragmentation simulation of IED devices), used to protect 5 mm-thick Armox 500T steel plate. The ALFC shield is composed of the ALF energy-absorbing subsystem and a 99.7% Al2O3 alumina ceramic layer. The ALF subsystem is designed to absorb blast wave impact energy induced by explosive materials up to 10 kg TNT. The ceramic layer is aimed at stopping FSP fragments. The 5 mm-thick Armox 500T steel plate reflects the body bottom segment of a light armoured vehicle. The main purpose of the study is to determine the minimum thickness of the ceramic layer at which the 5 mm-thick Armox 500T steel plate is fully protected from perforation. The ALF subsystem has the following layered structure: Al2024 aluminium alloy plate, SCACS hybrid laminate plate, ALPORAS aluminium foam, SCACS hybrid laminate plate. The layers are joined with Soudaseal 2K chemoset glue. SCACS hybrid laminate contains the following components: VE 11-M modified vinylester resin (matrix), SWR800 glass S plain weave fabric, Tenax HTA40 6K carbon plain weave fabric, Kevlar 49 T 968 aramid plain weave fabric. The total thickness of the ALF shield amounts to 76 mm. In the numerical modelling, the aluminium alloy plate and Armox 500T steel plate are working in the elasto-plastic range according to Johnson–Cook model. The 99.7% Al2O3 alumina ceramic is working in elasto--hort range according to JH-2 Johnson-Holmquist model. The simulations correspond to large displacements, large deformations and contact among all the components of the system. In FE mesh, the 8-node 24 DOF hexahedral finite elements with single integration point have been used. Additional failure criteria governing ad-hoc erosion of finite elements have been applied. The FEM modelling, simulation and postprocessing have been carried out using Catia, HyperMesh, LS-DYNA and LS-PrePost systems. The simulation results are presented in the form of displacement - perforation contours and the FSP final deformation for both the FSP–shield-plate and the FSP-plate systems. It has been pointed out that 18 mm-thick ceramic layer protects the LAV body bottom plate from perforation.
    Źródło:
    Journal of KONES; 2012, 19, 4; 301-313
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of TiC Reinforcement on Wear Resistance of Magnesium Matrix Composite by FSP
    Autorzy:
    Singh, Balraj
    Singh, Jagdev
    Singh, Ravinder Joshi
    Powiązania:
    https://bibliotekanauki.pl/articles/2048864.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir processing
    FSP
    wear behavior
    surface composites
    Mg composites
    TiC composite
    Opis:
    In the current study, wear performance of pure magnesium (Mg) and composite fabricated with titanium carbide (TiC) reinforcement is investigated under various loading and sliding velocity conditions. The Mg-matrix composite is prepared by friction stir processing (FSP) carried out at optimized values of process parameters. Sliding wear tests on Mg and friction stir processed (FSPed) Mg+TiC surface composite were done on pin-on-disc configuration. The consequence of the normal load applied and sliding velocity on wear behaviour of the two materials is evaluated by performing the tests at two normal loads of 6 N and 12 N and three sliding speeds of 0.5 m/s, 1.5 m/s and 4.5 m/s. FSPed composite found to exhibit an enhanced wear resistance as compared to that of pure Mg. To get an insight into the possible types of mechanisms for wear of the composites sample under varying load and sliding speeds conditions, the worn test specimens are subjected to scanning electron microscopy (SEM). SEM/EDS analysis revealed that oxidation, ploughing, trailing edge and 3-body abrasive wear were the predominant mechanisms for the wear of samples at a different set of experimental conditions. The tensile strength of the FSPed surface composite was found to be 25% higher than pure Mg. Wear resistance was found to increase by about 33%.
    Źródło:
    Archives of Metallurgy and Materials; 2022, 67, 1; 293-302
    1733-3490
    Pojawia się w:
    Archives of Metallurgy and Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Numerical modelling and validation of 12.7 MM FSP impact into ALFC shield - ARMOX 500T steel plate system
    Autorzy:
    Klasztorny, M.
    Świerczewski, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/242187.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Techniczny Wojsk Lotniczych
    Tematy:
    light armoured vehicles
    passive protection
    IED
    FSP
    numerical modelling
    simulation
    validation
    Opis:
    The study develops a methodology for numerical modelling and simulation of a 12.7 mm 13.4 g FSP fragment impact into the ALFC shield – ARMOX 500T steel plate system. The ALFC shield is composed of the ALF energyabsorbing subsystem and a 10 mm-thick 99,7% Al2O3 alumina ceramic layer. The ALF subsystem is designed to absorb blast wave impact energy induced by explosive materials up to 10 kg TNT. The ceramic layer is designed to stop fragments from IED explosion. The 5 mm-thick Armox 500T steel plate constitutes the body bottom segment of a light armoured vehicle. The ALF subsystem has the following layered structure: Al2024 aluminium alloy plate, SCACS hybrid laminate plate, ALPORAS aluminium foam, SCACS hybrid laminate plate. The layers are joined with Soudaseal 2K chemoset glue. SCACS hybrid laminate contains the following components: VE 11-M modified vinylester resin (matrix), SWR800 S-glass plain weave fabric, Tenax HTA40 6K carbon plain weave fabric, Kevlar 49 T 968 aramid plain weave fabric. The total thickness of the ALFC shield amounts to 90 mm. Proof ground tests of a 12.7 mm 13.4 g FSP fragment impact into the ALFC shield - ARMOX 500T steel plate system have been performed at impact velocity 715 m/s and used for experimental validation of numerical modelling and simulation. In the numerical modelling, the aluminium alloy plate and Armox 500T steel plate are working in the elasto-plastic range according to Johnson-Cook model. The 99.7% Al2O3 alumina ceramic is working in elasto-short range according to JH-2 Johnson-Holmquist model. The simulations correspond to large displacements, large deformations and potential contact among all the components of the system. In FE mesh, the 8-node 24 DOF hexahedral finite elements with single integration point have been used. Failure criteria governing ad-hoc erosion of finite elements have been applied. The FEM modelling, simulation and postprocessing have been carried out using Catia, HyperMesh, LS-DYNA and LS-PrePost systems. The simulation results in the form of displacement/penetration contours and the FSP final deformation have been compared with the experimental results.
    Źródło:
    Journal of KONES; 2012, 19, 4; 291-299
    1231-4005
    2354-0133
    Pojawia się w:
    Journal of KONES
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Symulatory odłamków
    Simulators of fragments
    Autorzy:
    Piątek, B.
    Zarzycki, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/235138.pdf
    Data publikacji:
    2016
    Wydawca:
    Wojskowy Instytut Techniczny Uzbrojenia
    Tematy:
    odłamek
    odłamek standardowy
    poziom ochrony
    odłamek FSP
    odłamek insensitive
    odłamek IED
    shrapnel
    standard shrapnel
    level of the protection
    fragment simulating projectiles
    FSP
    insensitive shrapnel
    IED fragment
    Opis:
    W artykule opisano wybrane symulatory odłamków (ang. avatar). Przedstawiono także przykłady odłamków rzeczywistych, opisano odłamek standardowy o masie 1,1 g oraz odłamki o większej masie (odłamki FSP [1]/„odłamki zastępcze”/„uśrednione odłamki rzeczywiste” / „symulacyjne odłamki rzeczywiste” - używane podczas badań balistycznych np. kamizelek kuloodpornych, hełmów, osłon balistycznych, czy ostrzału wozów bojowych, transporterów. Szczegółowo został opisany „odłamek zastępczy” - odłamek FSP jaki powstaje w wyniku detonacji 155 mm pocisku odłamkowo-burzącego oraz przedstawiono poziomy ochrony osłon balistycznych określane z jego wykorzystaniem. Przedstawiono także „odłamek in sensitive” (odłamek imitujący działanie pocisku na amunicję posiadającą materiały wybuchowe) używany do sprawdzenia wrażliwości amunicji na oddziaływanie bodźców mechanicznych. Ustosunkowano się do „odłamka IED” – odłamki z pułapki-miny, „chmury odłamków” symulujących efekt improwizowanego ładunku wybuchowego IED [2] (ang. Improvised Explosive Device) powstającego w czasie wybuchu fragmentującego IED.
    Some fragment-simulating projectiles (FSP) also named as avatars are described in the paper. Following examples of real fragments are also presented: standard fragment with the weight of 1.1 g and fragments with greater weight (FSP fragments [1], substitute fragments, average-sized shrapnel, real simulating fragments) used for ballistic tests of e.g. bullet-proof jackets, helmets, ballistic screens, or for firing to combat vehicles and transporters. A detailed description of FSP substitute shrapnel created at the detonation of 155 mm high ex-plosive shell is included with the classes of ballistic protections which are determined by using it. Moreover an insensitive shrapnel (shrapnel imitating the impact of a projectile on am-munition filled with explosive material) used for checking the susceptibility of ammunition against action of mechanical stimuli is present-ed. An opinion about the “IED shrapnel”, fragments from mine traps, “clouds of fragments” simulating the effect of an improvised explosive device (IED) [2] created at IED fragmentation explosion [1] is also ex-pressed.
    Źródło:
    Problemy Techniki Uzbrojenia; 2016, 45, 138; 87-99
    1230-3801
    Pojawia się w:
    Problemy Techniki Uzbrojenia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microstructural Characterisation of Friction Stir Processed Cast AlSi9Mg Aluminium Alloy
    Autorzy:
    Węglowski, M. S.
    Powiązania:
    https://bibliotekanauki.pl/articles/379980.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cast aluminium alloy
    friction stir processing
    FSP
    microstructure
    stop aluminium
    obróbka tarciowa
    mikrostruktura
    Opis:
    Aluminium alloy castings become more popular when a refined microstructure and a uniform distribution of Si particles are easily produced. One of the technologies that can fulfil these requirements is Friction Stir Processing (FSP). Therefore, the formation of various microstructural regions during FSP of AlSi9Mg alloy has been studied. It is presented that each of the regions are characterized by unique microstructures. Prior to FSP, the microstructure of a representative as-cast aluminium alloy was composed of Al dendrites and a nonuniform distribution of Si and Fe. FSP microstructurally modified and significantly refined the as-cast material, effectively eliminating the microstructural segregation and porosity of the base material. The characteristic microstructures are reflected in the hardness distribution. The hardness of the modified area was different from the base material.
    Źródło:
    Archives of Foundry Engineering; 2014, 14, 3 spec.; 75-78
    1897-3310
    2299-2944
    Pojawia się w:
    Archives of Foundry Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of friction stir processing (FSP) on microstructure and hardness of AlMg10/SiC composite
    Autorzy:
    Iwaszko, J.
    Kudła, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/200735.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    friction stir processing
    AlMg10/SiC composite
    microstructure
    kompozyt AlMg10/SiC
    mikrostruktura
    FSP
    Opis:
    The AlMg10 aluminum alloy reinforced with SiC particles was subjected to friction stir processing (FSP). The composite was made by mechanical mixing and gravity casting. The mass fraction of SiC particles in the composite was about 10%. Evaluation of the effects of FSP treatment was performed by means of light microscopy, scanning electron microscopy, EDS and hardness measurement. It was found that the inhomogeneous distribution of SiC particles and their agglomeration, which were observable in the cast composite, were completely eliminated after FSP modification. The treatment was also accompanied by homogenisation of the material in the mixing zone as well as fragmentation of both the matrix grain of the composite and SiC particles. In the case of SiC particles, a change in their shape was also observed. In the as-cast composite, particles with dimensions from 30 to 60 μm and a sharp-edged polyhedral shape prevailed, while in the material subjected to friction treatment, particles with dimensions from 20 to 40 μm and a more equiangular shape prevailed. Pores and other material discontinuities occurring frequently in the as-cast composite were completely eliminated after friction modification. The recorded changes in the microstructure of the material were accompanied by an increase in the hardness of the composite by nearly 35%. The conducted investigations have shown that FSP modification of the AlMg10/SiC composite made by the casting method leads to favorable microstructural changes in the surface layer and may be an alternative solution to other methods and technologies used in surface engineering.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2019, 67, 2; 185-192
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Role of tool rotational speed on the tribological characteristics of magnesium based AZ61A/TiC composite developed via friction stir processing route
    Autorzy:
    Sagar, P.
    Handa, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/367279.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    friction stir processing
    AZ61A magnesium alloy
    microhardness
    wear
    proces tarciowej modyfikacji warstw wierzchnich z mieszaniem materiału
    FSP
    stop magnezu AZ61
    mikrotwardość
    zużycie
    Opis:
    Purpose: A new composite material was prepared and Different properties such as hardness and tribological behaviour of the fabricated metal matrix composite (MMC) was investigated and compared with the base AZ61A magnesium alloy. Design/methodology/approach: For the current research work, state-of-the-art technology, Friction stir processing (FSP) was performed to develop magnesium based AZ61A/TiC composite at optimized set of machine parameters. Findings: Increasing tool rotational speed ultimately leads in enhanced hardness, which further gives superior tribological properties as compared to base AZ61A alloy. Wear observations suggests a combination of abrasive and adhesive wear mechanism. Research limitations/implications: More microstructural and mechanical properties can be examined. Practical implications: The idea behind selecting AZ61A is mainly due to its increasing use in bicycle pedals and military equipment’s where at certain places it needs to encounter friction. In this current work, microhardness study and wear behaviour of AZ61A/TiC composite processed via FSP were examined. Originality/value: Paper is completely new and no work has been done till date considering this material and preparing composite with nanoparticles TiC.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2020, 101, 2; 60-75
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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